My boyfriend dumped me because I am insecure?

I used to be confident, have goals, have lots of hobbies etc but in the past few months I've gotten low-self esteem and I've become insecure. I asked him if he wants to break up, he said no, I had some emotional episodes (like crying, yelling etc) and after a few months he said that I was insecure and needed to work on myself, like in the beginning I was confident and secure etc.

how stressful is on a relationship guys?
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*how stressful is this on a relationship? and how stressful is to have a girl who is very dependent on a guy?
My boyfriend dumped me because I am insecure?
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